From 9492587cf35d370db33ef4b38375dfb35a105b61 Mon Sep 17 00:00:00 2001 From: KAMEZAWA Hiroyuki Date: Tue, 22 Sep 2009 16:45:45 -0700 Subject: kcore: register text area in generic way Some 64bit arch has special segment for mapping kernel text. It should be entried to /proc/kcore in addtion to direct-linear-map, vmalloc area. This patch unifies KCORE_TEXT entry scattered under x86 and ia64. I'm not familiar with other archs (mips has its own even after this patch) but range of [_stext ..._end) is a valid area of text and it's not in direct-map area, defining CONFIG_ARCH_PROC_KCORE_TEXT is only a necessary thing to do. Note: I left mips as it is now. Signed-off-by: KAMEZAWA Hiroyuki Cc: Ralf Baechle Cc: Benjamin Herrenschmidt Cc: WANG Cong Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/Kconfig | 4 ++++ arch/ia64/mm/init.c | 3 +-- arch/x86/Kconfig | 4 ++++ arch/x86/mm/init_64.c | 4 +--- fs/proc/kcore.c | 19 ++++++++++++++++++- 5 files changed, 28 insertions(+), 6 deletions(-) diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig index 011a1cdf0eb..6851e52ed5a 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -500,6 +500,10 @@ config HAVE_ARCH_NODEDATA_EXTENSION def_bool y depends on NUMA +config ARCH_PROC_KCORE_TEXT + def_bool y + depends on PROC_KCORE + config IA32_SUPPORT bool "Support for Linux/x86 binaries" help diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index 286b98aa854..3f95ea1d6fb 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -617,7 +617,7 @@ mem_init (void) long reserved_pages, codesize, datasize, initsize; pg_data_t *pgdat; int i; - static struct kcore_list kcore_mem, kcore_kernel; + static struct kcore_list kcore_mem; BUG_ON(PTRS_PER_PGD * sizeof(pgd_t) != PAGE_SIZE); BUG_ON(PTRS_PER_PMD * sizeof(pmd_t) != PAGE_SIZE); @@ -640,7 +640,6 @@ mem_init (void) high_memory = __va(max_low_pfn * PAGE_SIZE); kclist_add(&kcore_mem, __va(0), max_low_pfn * PAGE_SIZE, KCORE_RAM); - kclist_add(&kcore_kernel, _stext, _end - _stext, KCORE_TEXT); for_each_online_pgdat(pgdat) if (pgdat->bdata->node_bootmem_map) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e4ff5d1280c..7c7a54bed4a 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -1204,6 +1204,10 @@ config ARCH_DISCONTIGMEM_DEFAULT def_bool y depends on NUMA && X86_32 +config ARCH_PROC_KCORE_TEXT + def_bool y + depends on X86_64 && PROC_KCORE + config ARCH_SPARSEMEM_DEFAULT def_bool y depends on X86_64 diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index da2cae7427a..a0c2efb10cb 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -647,8 +647,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); #endif /* CONFIG_MEMORY_HOTPLUG */ -static struct kcore_list kcore_mem, kcore_kernel, - kcore_modules, kcore_vsyscall; +static struct kcore_list kcore_mem, kcore_modules, kcore_vsyscall; void __init mem_init(void) { @@ -678,7 +677,6 @@ void __init mem_init(void) /* Register memory areas for /proc/kcore */ kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT, KCORE_RAM); - kclist_add(&kcore_kernel, &_stext, _end - _stext, KCORE_TEXT); kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN, KCORE_OTHER); kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c index e10d360110b..fdde1cc7839 100644 --- a/fs/proc/kcore.c +++ b/fs/proc/kcore.c @@ -21,6 +21,7 @@ #include #include #include +#include #define CORE_STR "CORE" @@ -374,10 +375,26 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos) static struct kcore_list kcore_vmalloc; +#ifdef CONFIG_ARCH_PROC_KCORE_TEXT +static struct kcore_list kcore_text; +/* + * If defined, special segment is used for mapping kernel text instead of + * direct-map area. We need to create special TEXT section. + */ +static void __init proc_kcore_text_init(void) +{ + kclist_add(&kcore_text, _stext, _end - _stext, KCORE_TEXT); +} +#else +static void __init proc_kcore_text_init(void) +{ +} +#endif + static int __init proc_kcore_init(void) { proc_root_kcore = proc_create("kcore", S_IRUSR, NULL, &proc_kcore_operations); - + proc_kcore_text_init(); kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, VMALLOC_END - VMALLOC_START, KCORE_VMALLOC); return 0; -- cgit v1.2.3